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Encephalitis

Definition

Encephalitis is inflammation of the brain. The inflammation may involve the whole brain or just parts of the brain. Encephalitis may just occur in individuals (sporadic) or may affect many people in a particular area (epidemic).

Causes

Encephalitis is most often caused by a viral infection. In the United States, the most common cause of sporadic encephalitis is the
herpes simplex virus
(HSV). Epidemic causes of encephalitis are usually
mosquito-
or tick-borne viruses.

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.